Answers by TheMediTary.Com - Last updated: 12-Jul-2023
XR or ER is short for extended-release which means the pill is formulated so that the drug is released slowly over time.
This has the advantage of taking pills less often and there may be fewer side-effects as the levels of the drug in the body are more consistent in extended-release formulations.
Examples of extended-release drugs include:
- Effexor XR
- Nucynta ER
- Ultram ER
- Xanax XR
Related: Medical Abbreviations on Pharmacy Prescriptions